Fig. 9

Schematic presentation of the neurogenesis of A. farreri larvae. Serotonin-immunoreactive (5-HT-lir) elements are magenta; FMRFamide-lir elements are green; and catecholaminergic elements are blue. Black outlines provide a schematic overview of larval morphology and organs. d/v and a/p—orientation of larvae on the scheme. Three developmental stages are shown: a–c early veliger, d–f late veliger, g–i pediveliger. Somata are shown as asterisks. Prospective ganglia are shown as colored circles with the corresponding signatures of the ganglia or AO. The colored lines represent neurites connecting neurons or ganglia. Dotted lines represent the innervation of the pediveliger organs. Abbreviations: a—anus, AO—apical organ, CG—cerebral ganglia, CPG—cerebropleural ganglion, dn—dorsal neurons, eso—esophagus, esn—esophagus neurons, int—intestine, m—mouth, PG—pedal ganglia, PlG—pleural ganglion, st—stomach, stn -stomach neurons, velum, n—neurons of the velum, VG—visceral ganglia, vn—ventral neurons, vnc—visceral nerve cords. The orientation a—anterior, d—dorsal, p—posterior, v—ventral